a. 30 500 KVA, diesel-engine generator, 50HZ its mechanical angle 60 coil pitch angle =140 and its slot angle half the value of shorted pitch angle. Calculate Kd, Kp? b. Related to branch (a) the alternator star connected has 180 turns per phase used brushless excitation system as shown in fig. below with flux range from 0.0223 to 0.0543 web after increase in feeding residential load. Calculate generated voltage?

a. 30 500 KVA, diesel-engine generator, 50HZ its mechanical angle 60 coil pitch angle =140 and its slot angle half the value of shorted pitch angle. Calculate Kd, Kp? b. Related to branch (a) the alternator star connected has 180 turns per phase used brushless excitation system as shown in fig. below with flux range from 0.0223 to 0.0543 web after increase in feeding residential load. Calculate generated voltage?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.16P: A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and...

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8-pole 3-phase star-connected alternator with 144 grooves in its armature rotates at 900 rpm. There are 12 conductors in each groove in the armature of the alternator. The magnetic flux of one pole is 1.8.10 ^ 6 maxwels. Coils (1-16) were wound in -15 steps. Accordingly, find the phase and interphase voltages induced in the inductor of the alternator. (The speed of the alternator will be taken as synchronous speed ns.)
Suppose for designing a diesel engine power plant you have brought a diesel engine & an 8 pole Alternator which have flux per pole of 0.045Wb. Turn per phases of the alternator is 150. The engine is so run that the speed of the engine which is coupled to the Alternator is 750 rpm. Determine the frequency and value of induced voltage/phase.
B) 6 - pole alternator running at 1000 r.p.m. supplies an 8 - pole induction motor. What is the actual speed of the motor if ?the slip is 2.5%
Real Power Versus Voltage curve may be used to assess the a.Steady state voltage stability b.Loading of that particular AC Generator c.Dynamic voltage stability d.Complete Voltage stability 2- kinetic energy stored in the rotor of a synchronous alternator is given by a.G * H * w b.m * a c.0.5*m*v*v d.S * H
b) Two alternators are connected in parallel to feed a load together. The no-load frequency of the first alternator is 51.5 Hz and its slope is 1MW / Hz. The no-load frequency of the second alternator is 51.0 Hz and its slope is 1MW / Hz. The total power of the load fed by these two alternators is 2.5MW and the power factor is 0.8. Accordingly, at what frequency does this system work and what are the power values transferred to the load by each alternator.
In a Three-phase alternator, a given field current produces an armature current of 250 A on short-circuit and a generated e.m.f. of 1500 V on open-circuit. Calculate the terminal p.d. when a load of 250 A at 6.6 kV and 0.8 p.f. lagging is switched off. Calculate also the regulation of the alternator at the given load. Subject: Electrical engineering
Problems 1. Find the rms values of different harmonic components and total emf per phase for an alternator having following data: 50 Hz, 3-phase, 10 poles, 2 slots per pole per phase, double layer winding, 4 conductors per slot, coil span 150°, flux per pole (fundamental) 0.08, and third harmonic component 15%. All coils of a phase are in series. (Answer. 662.91 V, 53.265 V, 665.05 V) 2. A 6-pole alternator rotating at 1000 r.p.m. has a single-phase winding housed in 3 slots per pole, the slots in groups of three being 200 apart. If each slot contains 10 conductors, and the flux per pole is 2 × 10² Wb, calculate the voltage generated, assuming the flux distribution to be sinusoidal. (Answer. Eph=383.4961 V)
3- A 3-phase, 8-pole, star-connected alternator has 72 slots on the armature. Each slot has 12 conductors and winding is short chorded by 2 slots. Find distributed factor and pitch factor? Note : w.r.t. mean (with respect to)
13. A 3-phase, 16 pole alternator has a star connected winding with 144 slots and 10 conductors per slot. The flux/pole is 0.04 wb (sinusoidal) and the speed is 375 rpm. Find the frequency and phase and line e.m.f. The total turns/phase may be assumed to series connected. [50 Hz, 2035 Hz, 3525 V] (Rajiv Gandhi Technical University, Bhopal, 2000)
5. A 3-phase. 16-pole alternator has a star-connected winding with 144 slots and 10 conductors per slot. The flux per pole is 30 mWb sinusoidally distributed. Find the frequency, the phase and line voltage if the speed is 375 rpm. [50 Hz; 1530 V; 2650 V] (Electrical Machines-I, Indore Univ. April 1977)
4 DECIMAL PLACES. The stator of a 3-phase, 16-pole alternator has 144 slots and there are 4 conductors per slot connected in 2 layers and the conductors of each phase are connected in series. If the speed of the alternator is 397 rpm, calculate (a) kc, (b) kd, and (c) the emf inducted per phase. The resultant flux in the air-gap is 5 x 10-2 webers per pole sinusoidally distributed. Assume the coil span as 150° electrical.
Generate a conclusion on this following statements: Determine and analyze the voltage regulation characteristics of the alternator with resistive, capacitive, and inductive loading.